<?php
class Resize_Image {

     var $image_to_resize;
     var $new_width;
     var $new_height;
     var $ratio;
     var $new_image_name;
     var $save_folder;

     function resize() {
         if(!file_exists($this->image_to_resize)) {
             exit("File ".$this->image_to_resize." does not exist.");
         }

         $info = GetImageSize($this->image_to_resize);

         if(empty($info)) {
             exit("The file ".$this->image_to_resize." doesn't seem to be an image.");
         }

         $width = $info[0];
         $height = $info[1];
         $mime = $info['mime'];

         /* Keep Aspect Ratio? */

         if($this->ratio) {
             // if preserving the ratio, only new width or new height
             // is used in the computation. if both
             // are set, use width

             if (isset($this->new_width)) {
                 $factor = (float)$this->new_width / (float)$width;
                 $this->new_height = $factor * $height;
             } else if (isset($this->new_height)) {
                 $factor = (float)$this->new_height / (float)$height;
                 $this->new_width = $factor * $width;
             } else exit("?neither new height or new width has been set");
         }

         // What sort of image?

         $type = substr(strrchr($mime, '/'), 1);

         switch ($type) {
             case 'jpeg':
                 $image_create_func = 'ImageCreateFromJPEG';
                 $image_save_func = 'ImageJPEG';
           $new_image_ext = 'jpg';
             break;

            case 'png':
                 $image_create_func = 'ImageCreateFromPNG';
                 $image_save_func = 'ImagePNG';
                 $new_image_ext = 'png';
             break;

             case 'bmp':
                 $image_create_func = 'ImageCreateFromBMP';
                 $image_save_func = 'ImageBMP';
                 $new_image_ext = 'bmp';
             break;

             case 'gif':
                 $image_create_func = 'ImageCreateFromGIF';
                 $image_save_func = 'ImageGIF';
                 $new_image_ext = 'gif';
             break;

             case 'vnd.wap.wbmp':
                 $image_create_func = 'ImageCreateFromWBMP';
                 $image_save_func = 'ImageWBMP';
                  $new_image_ext = 'bmp';
             break;

             case 'xbm':
                 $image_create_func = 'ImageCreateFromXBM';
                 $image_save_func = 'ImageXBM';
                 $new_image_ext = 'xbm';
             break;

             default:
                 $image_create_func = 'ImageCreateFromJPEG';
                 $image_save_func = 'ImageJPEG';
                 $new_image_ext = 'jpg';
         }

   // New Image
   $image_c = ImageCreateTrueColor($this->new_width, $this->new_height);

   $new_image = $image_create_func($this->image_to_resize);

   ImageCopyResampled($image_c, $new_image, 0, 0, 0, 0, $this->new_width, $this->new_height, $width, $height);

         if($this->save_folder) {
          if($this->new_image_name) {
                         $new_name = $this->new_image_name.'.'.$new_image_ext;
          } else {
                      $new_name = $this->new_thumb_name( basename($this->image_to_resize) ).'_resized.'.$new_image_ext;
          }

     $save_path = $this->save_folder.$new_name;
   } else {
     /* Show the image without saving it to a folder */
        header("Content-Type: ".$mime);
              $image_save_func($image_c);
        $save_path = '';
   }

       $process = $image_save_func($image_c, $save_path);
     return array('result' => $process, 'new_file_path' => $save_path);
   }

   function new_thumb_name($filename) {
     $string = trim($filename);
     $string = strtolower($string);
     $string = trim(ereg_replace("[^ A-Za-z0-9_]", " ", $string));
     $string = ereg_replace("[ tnr]+", "_", $string);
     $string = str_replace(" ", '_', $string);
     $string = ereg_replace("[ _]+", "_", $string);

     return $string;
   }
}
?>